PSP Volume Bar Modified Released !! 
NIGathan has shared a modified “impose_plugin.rco” which contains a new volume bar styled to resemble that from Windows Media Player 11. Another great mod to unique-ify your XMB!
Snazzy! For those wishing to create their own, grab a copy of ZiNgA BuRgA’s RCO Icon Editor and modify the corresponding .rco file (impose_plugin.rco). Remember to create a backup first!
Remember!! Flash Your PSP At Your Own Risk !!
Download:
PSP WMP Volume Bar Mod 
